Throughput

Completed items/Week Tells us the number of work items (stories) completed aggregated for each week which is an indication of how stable the throughput is.

Throughput (Count/Date) tells us the number of stories delivered aggregated every week. The date is the begining monday of every week.

Throughput (#Weeks/Count) Tells us; How many weeks do we have were the throughput has a particular number? Is this the sustainable pace of delivery?